hi,everybody. My own fem code has caled such a poisson problem succesfully. and now I want to use it as my pressure poisson equations solver. I need a stand veloctiy and pressure distribution at a certain time as my references. Can any bode being successful in the calculation of lid driven flow in a square cavity by using quad element can send me one copy? thank you very much and if you can please help me.

oh.sorry, the example expression have strange form here. I write again: d/dx(dt/dx)+d/dy(dt/dy)=0. for a square domain with unit length: t=t1 when x=0,x=1,y=0 t=tm*sin(pi*x)+t1 analytic answer according to JP Holman: t(x,y)=tm*sinh(pi*x)*sin(pi*y)/sinh(pi)+t1 as pi=3.1415926